I've had desktops and laptops for YEARS  Some with Windows 98 - Some with ME - Some wtih XP - ALL of which were totally  capable of adjusting to, and worked great minus a couple quirks specific to that OS..

NOT VISTA!!!  IS SUCKS!!!!  I absolutely HATE IT and am so sick of seeing that little spinny "wait" symbol and "NOT RESPONDING" errors that I actually look forward to coming to my office to use my Desktop with ME over my BRAND NEW IMB with Vista!!

I am sooooo getting Windows 7 asap!!!!